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- Title
Contributions of Wind, Ocean Intrinsic Variability, and ENSO to the Interannual Variability of the South Vietnam Upwelling: A Modeling Study.
- Authors
Da, Nguyen Dac; Herrmann, Marine; Morrow, Rosemary; Niño, Fernando; Huan, Nguyen Minh; Trinh, Nguyen Quoc
- Abstract
The summer South Vietnam Upwelling (SVU) is a major component of the South China Sea circulation where it also influences ecosystems. Here we revisit the existing knowledge of the SVU interannual variability. Based on a set of 15‐year eddy‐resolving sensitivity simulations, we quantify the respective contributions from different factors (atmospheric, river, and oceanic forcings; ocean intrinsic variability; and El Niño Southern Oscillation) to this interannual variability and explore the underlying mechanisms. Our sea surface temperature upwelling indices allow us to quantify the strong SVU interannual variability in terms of strength and spatial distribution. Strong SVU years are offshore dominant with SVU centers located within 11–12°N and 110–112°E, whereas weak SVU years are coastal dominant with SVU centers located near the coast and spanning a larger 10–14°N latitude range. Our study confirms the leading influence of the summer wind and further reveals that coastal SVU variability is related to the variability of the eastward jet that develops from the coast, whereas offshore SVU variability is strongly driven by the spatiotemporal collocation of wind stress curl with cyclonic eddies. Ocean intrinsic variability, and to a lesser extent perturbations induced by river discharge and lateral oceanic conditions, strongly triggers interannual variability of background eddy circulation, thus of the SVU. El Niño Southern Oscillation influences the SVU mainly through its direct influence on summer winds. Key Points: Summer wind and ocean intrinsic variability are key factors that determine the interannual variability of the South Vietnam UpwellingOffshore upwelling is driven by the collocation between eddy‐induced vorticity and wind stress curlEl Niño Southern Oscillation mainly impacts on the upwelling via summer wind modulation
- Subjects
SOUTH China Sea; UPWELLING (Oceanography); CLIMATE change; WINDS; BATHYMETRY
- Publication
Journal of Geophysical Research. Oceans, 2019, Vol 124, Issue 9, p6545
- ISSN
2169-9275
- Publication type
Article
- DOI
10.1029/2018JC014647